
	<!doctype html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>css3环形进度条</title>
	<script src="/static/js/jquery-1.8.3.min.js"></script>
<style>
*{margin: 0;padding: 0;}
.box{width:200px;height:200px;margin:10px auto;position:relative;}
.box div{position:absolute;top:0;left:0;border-radius:50%;height:160px;width:160px;-webkit-transition:all .2s ease-in-out;-moz-transition:all .2s ease-in-out;}
.box .bg{border:silver 20px solid}
.box .bg2{border:silver 20px solid;clip:rect(0,100px,200px,0);}
.box .rount{border:green 20px solid;clip:rect(0,100px,200px,0);-webkit-transform:rotate(0deg);}
.box .rount2{border:green 20px solid;clip:rect(0,200px,200px,100px);-webkit-transform:rotate(0deg);display:none}
.box .num{font:bold 24px/160px tahoma;text-align:center;color:green;top:20px;left:20px;z-index:9;}
.points{width:200px;margin:10px auto;text-align: center;}
</style>
</head>

<body>
<div class="box">
	<div class="bg"></div>
	<div id="rount" class="rount"></div>
	<div class="bg2"></div>
	<div id="rount2" class="rount2"></div>
	<div id="num" class="num">0</div>
</div>
<div class="points">
	<span>0</span>
	<input type="range" id="points" min="0" max="100" step="1" value="0" />
	<span>100</span>
</div>

<script>
	function round(){
		var points = document.getElementById('points'),
			rount = document.getElementById('rount'),
			rount2 = document.getElementById('rount2'),
			num = document.getElementById('num');
		points.onchange=function(){
			var n =points.value;
			num.innerHTML = n + "%";
			if(n<=50){
				rount.style.webkitTransform="rotate(" + 3.6*n + "deg)";
				rount2.style.display="none";
			}else{
				rount.style.webkitTransform="rotate(180deg)";
				rount2.style.display="block";
				rount2.style.webkitTransform="rotate(" + 3.6*(n-50) + "deg)";
			}
		};
	}
	round();

	$("#points").val(40);
	$("#points").change()
</script>
</body>
</html>